Elastic-fluid turbine.



PATENTED FEB. 26, 1907 0. W. DAKE. ELASTIC FLUID TURBINE.

APPLICATION FILED MAR. 22.1906.

UNITED STATES PATENT OFFICE.

CHARLES W. DAKE, oi chino RAPIDS, MICHIGAN.

ELASTIC-FLUID TURBINE..

Specification of Letters Patent.

Patented Feb. 26, 1907.

Application filed March 22,1906. Serial No. 3 07.457.

and useful Improvements in- Elastic-Fluid Turbines, of which the following is a specification. v p I This invention relates to improvements in elastic-fluid turbines, and it relates more particularly to improvements in the buckets, and

particularly to buckets of the recurved U- shape type. As these buckets are ordinarily constructed and arranged 'at an angle to the face of the turbine disk or wheel or at an anle to the eriphery'thereof, the fluid travels different istances from the nozzle before it develops the energy of its impact and reaction u on the bottom of the bucket. The result has been that buckets are made ordinarily of quite narrow dimensions, where of course it is obvious that if they were made of larger dimensions they could be made with greater facilit and there would be less en ergy consume in friction on the separatingwalls.

The objects of this invention are, first, to

rovide an improved form of recurved bucket in which the power developed from the impact of the fluid is done at a substantially uniform distance from the mouth of the nozzle, conse uently enabling the utilization of the jet of e astic fluid to the best possible advantage; second, to provide a form of bucketwhichwill enable the utilization of the face or surface of the turbine-disk with a minimum number of separate and distinct buckets.

Further objects and objects relating to the details of construction will appear from the detailed descri tion to follow.

I accomplis the object of my invention by thedevices and means described in the following specification.

The invention is clearly defined and pointed out in the claims.

The ortions of a steam-turbine which embody tfie features of my invention are clearly illustrated in the accompanying drawings, forming a part of this specification, in which Figure 1 is a detail sectional view-through a row of buckets with a nozzle in position taken on a line corresponding to line Z Z of Fig. 2. Fig. 2 is a plan view of buckets looking at the face of same, the nozzle being omitted. Fig. 3 is a detailed oblique sectional view taken on a line X X of Fig. 1. Fig. 4 is a detailed sectional view of a slight modification of. the buckets, taken on a line corre sponding to line Z Z' of Fig. 2, the U-sha ed buckets being shown with 'walls curve in cross-section. ordinary form of U-shaped recurved bucket,

' taken on a linecorresponding to line Z Z of Fig. 2.

. 3 In the drawings similar numerals of reference refer to similar parts throughout the several-views.

I show a section of a turbine-wheel or disk 1,'w'ith the recurved buckets with the oblique nozzle 2 leading from the nozzle-bowl 3 to deliver elasticfluid into the said buckets.

The complete seriesare separatedfrom each other by the separating-walls 10, which walls have circular notches at the center for conveniencc in machining out the steps by a rotary cutter or m illing-tool.

The dotted line 11, Fig. 1, shows the posi tion that-the ordina recurved bucket would take in the disk, an it will be observed that Fig. 5 is a detailed view of the the disk would reci luire to be considerably thicker, and it W1 be observed that the de th of the bucket'would vary considerab y, so that the jet of steam delivered from the nozzle would have a comparatively short distance to travel to react on the bucket when the bucket first came into work and would have a long distance to travel as it was leaving the nozzle.

being indicated by 4, the bottom of same by 7, and the general form of this bucket, if it was attempted to arrange it in a thinner disk, is indicated 'by the dotted lines S .S. A

bucket of that shape would be very inefiect ive, as much of the energy would be consumed in the friction and pressure on the opposite walls.

With the particular form of that I have illustrated it will be seen thatthe elastic fluid travels substantially the same distance no matter what the position of the bucket is in passing the nozzle, and thereforethe nozzle can be adjusted and regulated at just the proper distance to secure the best results.

- tegral construction the buckets can be made 30 have illustrated in Fig. 1, I am aware that the stepped wall of the bucket can be modicurved walls 7, 8", and 9'. curved in cross;v

said peculiar curved cross-section; but this form of buckets, asillustrated in Fig. 5.

While I prefer the form'ofbuckets which I l iied, as appears in Fig, 4, although there is considerable loss of energy in this.niodification. The buckets 4, 57 andfi have-the section, respectively which would result in considerable loss of energy onaccount of the.

would be a great'advance over the usual It narrow buckets. were made corresponding to the thickness of the Various steps 4, 5, and 6 of my improved bucket, it is clear that a great amount of energy would be consumed by friction on the dividing-walls, which would not result in the development of energy. .Therefore the advantageflof the particular. arrangement I have shown, which sef in'cletached pieces and attached or could be made up in separate parts built on the disk. I have not illustrated these other forms, preferring merely to illustrate the form of consource of supply.

similar radius.

struction preferred.

Having thus described my invention, what I claim as new; and desire to secure by Letters Patent, is

, 1v The combination of a turbine disk-or I wheel withrbuckets of the U-shaped recurved type, formedinsteps, the steps being similar and arranged side by side in substantially parallel relation; .and a nozzle delivering .to the said buckets.

2; A turbine disk or wheel with buckets of the U-shaped recurved type formed of par.- allel steps of similar depth to receive impact at substanti ally the same distance from'the 3. A turbine disk or wheel withbucket's of the U-shaped recurved type formed of steps of similar depth to receive impact at substantially the same distance-from the source of supply.

4;. A turbine disk or wheel with buckets of the U-shaped recurved type whose curved walls are formed of steps of approximately 5. A turbine disk or wheel with bucketsof the U-shaped recurved type whose curved wall is formed of steps.

In witness whereof I have hereunto set my hand and seal in the presence of two witnesses.

CHARLES W. DAKE. [L 5.

Witnesses: v

FRED L. CHAPPELL, CLARA A. SABIN; 

